A STEREO/SECCHI COR2 Catalog of CME Properties Built via a 'Hybrid' (manual-automatic) Event Detection and Measurement Technique

Catalogs of Coronal Mass Ejection (CME) properties are an efficient and popular way to research the CME phenomenon. Up to now, all CME catalogs were based on observations from a single viewpoint and hence subject to the same projection effects. However, simultaneous CME observations from the two vantage points of the STEREO/SECCHI coronagraphs raises several issues: Is a CME always visible in both telescopes? Does it look the same, etc? To answer these questions, we compiled a cross-linked STEREO COR2 A/B catalog. First, we built, by visual inspection, a preliminary list of CME events observed by each of the two COR2 instruments, starting in 2007. The CME detection and tracking is carried out by a state-of-the-art supervised image segmentation technique named CORSET. Using a supervised technique, we seek to overcome the intrinsic caveats that both fully automated and fully manual methodologies exhibit, in particular when dealing with a bi-segmentation problem where the features of interest show different intensity levels, morphologies, and texture embedded in an ever-changing noisy background. We have successfully applied CORSET to about 30% of the total number of events in our list. The catalog contains a comprehensive list of the temporal evolution of the relevant morphological, kinematical, and dynamical properties of the CMEs uniquely identified and cross-referenced in both datasets. Here, we briefly review the technique, and present the first results on the analysis of the main characteristics of this set of CMEs throughout the whole period of the mission.